Portable electronic device with a graphical user interface



FIG. 1 is a front view of a portable electronic device with a graphical user interface in a longitudinal direction showing our new design; and,

FIG. 2 is a front view of another embodiment of a portable electronic device with a graphical user interface in a longitudinal direction showing our new design.

The broken lines showing portions of the portable electronic device and graphical user interface are for the purpose of illustrating environment structure and form no part of the claimed design. 

CLAIM We claim the ornamental design for a portable electronic device with a graphical user interface, as shown and described. 